*{
    margin: 0;
    padding: 0;
}
ul,li{
    list-style: none;
}
.container{
    margin: 100px 200px;
    display: flex;
}
.container .showBox{
    width: 400px;
    height: 400px;
    position: relative;
}
.container .showBox ul li img{
    width: 100%;
    height: 100%;
}
.container .showBox .box{
    position: absolute;
    top: 0;
    left: 0;
    width: 150px;
    height: 150px;
    background-color: pink;
    opacity: .5;
    pointer-events: none;
    display: none;
}
.container .smallBox{
    width: 400px;
   margin-top: 20px;
   
}
.container .smallBox ol{
    display: flex;
    justify-content: space-between;
}
.container .smallBox ol .active{
    border: 1px solid black;
}
.container .bigBox{
    margin-left:40px ;
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid black;
    overflow: hidden;
}
.container .bigBox img{
    position: absolute;
    top: 0;
    left: 0;
}